/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

// 改成Promise
new Promise((resolve) => {
  const a = 'hello'
  resolve(a)
}).then(value => {
    const b = 'lagou'
    return value + b
}).then(value => {
   const c = 'I ♥ U'
   console.log(value+c)
})

//尽量同步写法
function showStr() {
  const a = await Promise.resolve('hello')
  const b = await Promise.resolve('lagou')
  const c = await Promise.resolve('I ♥ U')
  console.log(a+b+c)
}

console.log(showStr)





